[Steve_Seattle]

"Are these additive?"

You would think there would be SOME additive effect, although probably falling short of 100%.

[ProtectOurFreedom]

I added them up and got to about 400%, so I’m WELL protected!

It’s a shame that none of the studies looked at them in combination since the many COVID prophylaxis protocols include three to six supplements, vitamins and minerals. I count six that I’m taking - Vits C & D; Melatonin; NAC; Quercetin; and Zinc. No Famotidine.